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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7089796683961e325a5aa292e7e25fd53d04eda931c48298496a734f3d5c441' 
  AND token = 'Rrp4l+HbzEZ64NGiRBCfVEUxPfNbQf4k//Ls6MOww1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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