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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d50690575e8764ca7d0aac993d49ac5baba4ed4cb52d14a7b52536296a59304' 
  AND token = 'KfRjU2I8+iDi+D3bUkMc1spf0WTKOJ5dEEfxpvJby8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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