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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af4ea3117de0690e4085bd5d7e144d104e25eabbdde218eccc5f41d28013f89' 
  AND token = 'PizlHDWqcvkTyYX0Eob3f9T6M2CDAbtxEvPoIqHm05I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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