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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f90ad50dabefa9448ee85d39a199b7f29f74c1509fde7578eee646222208f7' 
  AND token = '5hePpXmG4cjx5nEWc6ZCv9RVkFTcRCHlKQWxNXt4Iag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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