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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0c5331e2269c3e59077ea51f4efb93c6a06b5b0fbae0317efad454d0dc575a' 
  AND token = 'yXznmM0VbRGKKND3X9QWN7QN72vC6+s3+qC24BHTn+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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