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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899c15aa9741a67fef6fbf8ba0d1cda23a229f5db8c8ee2e44057f5c2460977d' 
  AND token = 'hJQp6ThzlqvuZLdXtuO08aEoo086GjX5xdFxYoob6o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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