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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c4586078e0d547558bf70cabf90ed2f6723749867a2b751e3f2747cf586eef' 
  AND token = 'w85oD7MHRrFDgaMafamhyetNwmSWrJ/4ctd94IZMgmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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