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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8ab90459f468d22503ec50256a520d6e5472b4c616fa624048432b5cc3ca1c' 
  AND token = 'o1wfR6a41Ns/16dW0NrHeKP2in29MZCxVeqBk09qKcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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