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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bce64f1c637a833f070e8dcad08dfdb4a27969e12dcc33140f1954c41afc2b' 
  AND token = '5uzW7AJFTeulH1+u1QwIgHA50LhPGNGJON2+PDL3I6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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