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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db084ee5fdb22786a1929dbc44ef05bd815359831a1d186b43759df268f7fb0' 
  AND token = 'rA/Kr0Qn7CmffpCV9Yv+YmjllN3yui2WnBrdpjTSkxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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