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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5e5beaefafcd7473e2a21f1653927c0d83032a4dc6f3b5ed9ae722495665dd' 
  AND token = 'yOLQ9N/2CmWTrSQCYt/tb/qe5N86m2C2FPVI5nv+1+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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