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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc1e805228eaee5863300ab160e915867f2e3735a83afde0643c8fcb6a020b8' 
  AND token = 'At63FgIrJpspCEsIbfvDnllL3sTH3sxwgljsAPgT4Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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