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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2368bc6d41cb4e13a2ff71cd0db9724e49c24ea8c46b1a513b7d157b1c9f0e89' 
  AND token = 'zNMXZ1ip2OSGbNO/Icz1VKT04LNSianCXF8ZITqVmWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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