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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e70c62f99a51ed6e4f19103193218bd8224066b616123490534b06c5a8593d4' 
  AND token = 'ovGtkBAiqOW3xGA45rxl7qG0KsVNDVMU3mNoaO/IwDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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