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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18eafcc3e7ca5e2b333e7bfb573f1c119aefcd9d750c1a969d52d1d0e3f0cd0' 
  AND token = '8q9qL1hZqfgI7cmwTQmYycKcPeMtNe3zdQhhP6nx97w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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