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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db7469e204e5e247ec8f29a7f8c1a9a1aa0f7ef66785b775689555e5aabd816' 
  AND token = 'nAVnWYipZoTMSZIr8u9B1U5wsoWJLkfNDmNFgM8utD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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