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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a1909b891ced16d35965988253b1d2261ad045330599dafdc73cc8c7244ced' 
  AND token = 'NpNQchJ+Ul89blAsJ4oahnGCQ+BfFpskDzy8DlgLGdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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