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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af8c20cdeeb980c41616e627183cefc4e2b7ef62c17c5b237d68d3002d9a8d9' 
  AND token = 'Xh0IXD84DLf8QBJtoBy4eu/VyFK90Z7Bud68+1heEHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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