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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b294a0043b2489d9e1243383daf2163c135c2c6a115d48746a88fb2374fe09' 
  AND token = '7zm9mQXlyrQvauKp/1+Cgsax8Z47rIfndVH5/aFymN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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