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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b3f13444691357bc6ce4d111281b2d951cd2fe223315d3a919aa649738d988' 
  AND token = 'pYcuPtknHS3F4QK13p8V0YEZ9Eu1/AR96vdxv4nQ8o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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