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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cd0f38ae28eb6da27ff2feee274d7be491df7816478e87c41c92cc9deb8970' 
  AND token = 'gNQ0/G+fR92UFGlpB+eWD9uicqLc/qKLrLwR6ZkNTww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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