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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27cabf5e382b39dcaf92aa8b4bd7a6609f0bea0c25fb564fb3cb2f9520076e67' 
  AND token = 'TYgd7T7O2Ty3kNysh7NZ3iVr0r/KH98YTSOIGI7JgsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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