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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf71e700dac974bf5298d72251ede288fe17e369cabd1be28bcf2275e2755b9' 
  AND token = 'N9vm8E6ET5GMx+Cab4JnFPsUX2Bg78DI7QthVTP3HDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}