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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd908f18f93d65b275171df1ddc5ef6bcb3d1704c3caa2f6950c1f6547f9750d5' 
  AND token = 'xlU84mygEpQiiKUjY0kaI1M2YRLPiddHGYkUnkNpOhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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