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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c612555faf1b40b8c543fe7e02d065db139c900a82820453e7c078511d6225b' 
  AND token = 'vNo9ZDl0PRDB+2S55a7iluIf/3S6T6pAunICjeTCSd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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