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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9687aa8ef2263db13e4e039f2d2665f66adc443b971d31ede538c3e3b69d0a5' 
  AND token = 'gGNo+18TskaIRfxDkXfaZN9Fymeqf8+qsaH7BFZhMT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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