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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6e7d9b13993c717788c6eb783ec08e99a7adee5452753606412bdb3b59705c' 
  AND token = 'tj4f3pyz1cMG8S6Dy0jYR5rmOhmDwkuW0jna1z9M6Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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