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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f5246c33d0f326bf012c8deba89280ab228f447137f57d76fbecb02b5f767b' 
  AND token = 'c/u3Ruqwtu7GlCScFQrofYwp0qexXVrwlRCgv9y1hcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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