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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14112bab0c27c0ad2f219266da7299f2b0e9f20833194c8506c21c9502f693e8' 
  AND token = 'rbP9aqwJ4gjGlygE0ePCqQVXSha04bPx6K9ZpHnb5rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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