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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9097e40ba18067d8c2d78e649ea6ff3409935d65b99e91b17cbb2d5e125a04' 
  AND token = '47h6ugtdg9FFMgs2spruCR/65tjs8Oe2bX++lQEep0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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