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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb12d5c8a83273ef081286fc8655d04c6203beda0349b692414bf0596aa4932' 
  AND token = 'TiYLS1z4OuLinEk4vq/eUQzAnp/n9qrqI79RtXWi+ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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