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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fb176f4fb8a96edaed5705b210225fe510c2e46fd6a0e1c1b446728dee19fd' 
  AND token = 'SuClIqQUFlqdjuX0zZyYed1v3fTfHtR4syZxOy/0pGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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