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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0da32387c77854e3d84bb15a0e79727d27342c6a474eb19a0f12474f7fb0569' 
  AND token = 'kksJPJ4rSqpgObe/VLRz77j8g0fKF63/pTbuCk95ybg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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