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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edcfd4b3a1453aa2e2adc0dd3b97e792496707e4afa7612b2ded9800dd4adc69' 
  AND token = 'tdbOGE1+VCMns7Pn4g6j0LQrUURhoubG577hAiW9PeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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