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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98ca2804c73e0abd32c2b54b277e5e41b5a9546ce8a165a43434f463b81b484' 
  AND token = 'NQodXfGOMZlRspu6n3YKe6uDXFla3o3rzD2zsMBuswM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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