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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11896259d298e0a16641871b8e55c9639df0b9dcd90c1155b52202b1b73462b3' 
  AND token = 'Uc//uSxWeUBB0fOPRUx2vKPsPnscgtFFc+QP1l72tWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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