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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7bbfcb26ff7014364ba303176c8a728931e3fbc97b0d3696744c14219a167b' 
  AND token = 'nRiYBG6gQkCZAaAj7/QgcV/Tp61XXgXlwQ2bBXHdW1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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