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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d986db9ad60fffe7d32530d43b823015e0198693ec012fecdcd0661a12e9dd' 
  AND token = '3iPB8foLnofvS+eJ6Ya+KZ6JWnc/Jyn+Nls1SQZ7YIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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