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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920bcccc445a0806151467466060f29e1d1d043ac1c0c37ee29ac1af37f6738f' 
  AND token = 'lROAvuR3fZq1P0j6x7Tj9h3qsiIVK+TUrt+HkUsYwvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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