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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854c5ba3f9b54a4984d91c88662c25ed3fa55e33c04a3c4f4c5efe887c9ed6e5' 
  AND token = '3DJskkeNofplAS2bkYxJH2AHAKT1sCZ8HP5W42PybmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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