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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b4ba77faddf74eedc3b0812f5ad406c4304f446830768b7e1cb1ab197c2ef1' 
  AND token = 'hV3Efril1AUUoEH0qcD1AXh9ChGqw2uU2g9fPElQdVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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