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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6dc0043698a1b8ba785b8f68e22e4ff5ed483ef1cca337aeb44d45c4672b3d' 
  AND token = 'KvoQzGTLMQgyCF7OTu4jR1dcPm10h3uTVBR/fc1eYWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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