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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132d23b88134edc4512f1d9f1d3b3ed1881e89a1f7917571deb463c13beb2ddf' 
  AND token = 'fMkmf4HrGMXvlMhTuB6Cs1O9qr5uO1of5q12OeuvRyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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