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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2af8af13f1e27487ab950ae281a3b92e7dd79b03a997a809cd5ed1f928f835f' 
  AND token = 'P8n9msf+jAMSlKJBsDmpihHAxGYBMGJb92/BCZv0cTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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