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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84c65f2c3befd161737b12d4238b6f85eae703e3d6b40b9fdc6ece4ee389f10' 
  AND token = '6FDMuKetErQ8wDA5IZLKAu0tiwmUVObaisOjBbgZEKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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