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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3970892518b16e85b8dbcb05bb87a3163b0c75cca889b4a97425454856f655' 
  AND token = '0ybY2RKio/juDV9gUm56r2dJ1DC3X8MmeL6C7aSIboo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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