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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19ef7f0926170908a21ddef7353b4ebdc17a19df38646dc421facb69fea8174' 
  AND token = 'N2Qp637ZOUFD5CEgM5xYMMV9+n0ZU0vf0E9/mrkQ4/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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