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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e801cc39f3e8d9b0a67e6a32de7745109707b408657eb245852deda676cf90' 
  AND token = 'yR1oMhpF1hiADcpUSoRKO5fuWCiky2ZtRo/iYel2CTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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