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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f9a92ada2fd2d91e9aa7d48af2eace42998df783c6d3dcc1dfe9b73ca77ebe' 
  AND token = '4zfDG4k2L36ftHF/wvv/z3cNv7rNMuZ3FzOt+KFDSLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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