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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc3d5775568ff44bc36e961db8e2cd4632e98947d99d0d7a6865c9a4e74ecc0' 
  AND token = 'diB/xteO+Z1/BVto6nd7LXC95ocqe74vlNrR+KCvwtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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