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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5ee26e67e12ce71cc4b794eca280394a7375134c7d454ac01f547a1c75677e' 
  AND token = '6FZlN8Asr8eKFY28NieWW+xwUJjTV+rFpiU63l3zpcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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