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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6f2c3168aaa7fa1f14cbf7af6bfe8f7a07c9e037017b47e80cb974bb78fded' 
  AND token = 'PNeZdbWpbuh9LdsVkV4D/naAPj/0MAcH3GGX4HBXrKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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