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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3c0bb411339a17487a1b05788f9db2b9ddc5f8f5055b07d53c8d0812c33795' 
  AND token = '3xvdPX7KvLpyAadrWkL0xN94yEpdG+olTYMw5begYfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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