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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c10b2550f7eef9c6335946a2e1012718c4f3688ebb3c314735711b44d54339' 
  AND token = '/dnE0AIvxaY0v3A2pOpIak9PEMhpWSnZJQbIFULTQYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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