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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0d3adcc87aff79c68f99434ec625b33d12677ac3520128669c1b323c6f4c77' 
  AND token = '/fBX105oFoen+wrkFpGA2H8GsI8fs7B54dkxnMRftDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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