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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4952211b6b8dba56cb3f1a05eea3187b1d3b38e49739db05f51fd61e218931' 
  AND token = 'v8cI68rnAzeZ9kk3fNGIXDYnKgY1A/8cywbWq29W6/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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