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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed20f0f06396f96ec806fcd34e3bb87db392b31fd3556d600d6ee47805cad31' 
  AND token = 'BRIdxuZNcBwkRHoF/mt3dxtI2i5aVlZbrACYzeFyuFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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