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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0008694986304d65ec7dbd45e4d892b1b82f7739833cddf146c24bb6acedbb74' 
  AND token = 'aBw9ylMYEedLyI0toMR3LOaTSU2U6uJ/WuFtEaj+1os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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