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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bc21fded95f05d946d73e77353cd6029535dd0abf776e4674e7382d147e90b' 
  AND token = '3M61fjVpI5fQq5RON7XzxNKAPRsD8zhifkoM8EdZdVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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