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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fe1079f295911a49878dd69ebb6e9effbd836b4b61bb8a44c53bd59ecc085f' 
  AND token = 'ALFCX+xd6EBGoP2S3sLOfYi8SaRUNwNztiBn76ZBOqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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