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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96514839032242f633c63bc933d2aca2e8391a2551f51eccec4f2550b75a8e3' 
  AND token = 'qQCaND9Aa5Zc/TxKzsEJ1tXcJNvYgnd8qyGqVnkGl2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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